Container



y 9, 1940. c. k. DUNLAP I 2,207,003 CONTAINER Filed June 14, 1938 2Sheets-Sheet 1 Curie: KTJzwzZa p M FMJ WWW July 9, 1940 c. K. DUNLAP2,207,003

CONTAINER Filed June 14, 1938 2 Sheets-Sheet 2 'IIIHHHIIIIIII PatentedJuly 9, 1940 UNITED STATES comma Charles K. Dunlap, Hartsville, S. C.,assignor to Sonoco Products Company,

corporation of South Application June 14,

3 Claims.

This invention relates to containers and particularly to containers ofall-paper construction and primarily intended for use in the dispensing.

of liquids. I 6 A paper container which is intended for use in the packg ng'and dispensing of liquids must of necessity be self-supporting, i.e., must maintain its shape at all times despite the unstable nature andoutward pressures exerted against its inner 10 surfaces at variouspoints by the container liquid, and despite the shocks and abrasions dueto rough handling in transportation or at the point of consumptionof'the liquid commodity. Naturally paper containers for such commoditiesas oil meet with widely varying conditions between the times when theyare charged and sealed and the times when they are 0 ned and thecontents discharged, some conta' ers travelling short. distances and notbeing subjected to any appreciable rough handling and other containersbeing transported longer distances to various points of consumption, ontrucks or railroads and are, en-

route, considerably buffeted.

A paper container which is fabricated in such manner that it is wellable to withstand all shock incident to handling and transportationwithout substantial injury must naturally be much more staunchlyconstructed than one which will not be subsequently subjected, aftercharging, to

rough handling.- Also a heavily built paper container is more costly tofabricate than one of light construction and hence the total cost ofdistributing a liquid commodity will be greatly in-v creased if all thecontainers in which such com- 35.modity is'packaged are constructed tosuccessfully withstand the most severe blows and shocks to which any oneof them may conceivably be subjected. 1 v

In accordance 'with the present invention a 40 paper container isprovided, which comprises essentially, in addition to the containerproper, a

reinforcing envelope which is separately formed and applied and whichmay or may not be used at the option of the container manufacturer,having in mind the ultimate destination of the container and the natureof transportation and handling shocks to which it will be subjectedenroute to suchdestination. Thetwo-part container provided by theinvention promotes economy in use of such containers for the dispensingof liquids since, while a container-of maximum strengthand' somewhatincreased cost, may be supplied where necessary, the strength and costof the container maybe reduced where the extra I strength is actuallynot necessary.

svillc, S. 0., a Carolina 1938,,Scrial No. 213,660 (m. 229-45) Theinvention pertains particularly to containers of the conical typethe'mo'st vulnerable portion of which, when charged, is the main 'memberor conical wall or body of the container.

The container proper is frusto-conical, having 6 flat parallel top andbottom closures and the conical body or wall is fabricated of sheetpaper,

- rolled on a mandrel; Where it is expected that the container, afterbeing charged, will be subjected to rough usage, a frusto-conical en- 10velope is slipped over the container body proper and secured in suchposition, the protective envelope likewise comprisinga sheet of paperrolled into conical form on a mandrel. This envelope; when used, issecured in position by means of an adhesive and is exteriorly decoratedwith designs or legends in the same manner that the body of thecontainer proper is normally decorated.

By the use of the novel protecting envelope the may likewise bestrengthened and the invention contemplates also the fabrication of acontainer of conical type in which the top and bottom closures are soapplied to the body thereof that the outer wall or protective envelope.engages portions of these closures and more firmly secures them inposition.

The invention likewise contemplates certain improvements-in the detailsof construction of the'top and bottom closures, quite regardless ofwhether or not the protective envelope is employed. Preferredembodiments of the invention are disclosed in the accompanying drawingsby way of example, in which:

Figure 1 is a perspective view of the container 86 proper, without theprotective envelope or outer wall, portions being broken away to showthe interior construction of the container and, to disclose the meansfor sealing its ends;

Figure 2. is a perspective view of the container 40 outer wall orprotective envelope;

Figure 3 is an axial section through the com pleted container withenvelope assembled therewith;

Figure 4 is an axial section through a modified 45 type of container towhichhas been applied a protective envelope;

Figure 5 shows in section the upper end of the same container and thetwo closure caps, the several parts being spaced apart; and

Figure 6 is an axial section through a. further andvery simple type ofcontainer with which the protective envelope may be used if desired.

3 Inx'the fabrication of the container proper,

which is shown in Figure 1, a sheet of paper is top and bottom closuresof the conical container 10 wound into conical form upon a conicalmandrel, the blank prior to the winding operation being coated with asuitable adhesive so that the several. convolutions of the paper arerigidly secured thereby into a rigid structure. After winding, the tipand base of the conical member are accurately trimmed so that theresulting container body, indicated at I0, is truly frusto-conical, itsupper and lower edges lying in parallel planes. Its outer surface maybe: decorated with legends and ornamental figures to indicate the natureof its contents, and the manufacturer thereof. Its bottom closurecomprises two flanged discs; an inner disc II and outer disc l2, theflange ll' of the inner disc being itself frusto-conical so as toclosely engage the inner surface of the frusto-conioal body Ill. Theflange I2 of the outer'disc is also frusto-conical, or at least is madeso by a rolling operation after assembly of the disc l2 and body It], inorder that the inner surface of this flange will closely engage theouter surface of the body I0. Suitable adhesive substances are employedto secure the discs in the positions in which they are shown and allsurfaces of the closure discs, as well as the inner surface, andpreferably also the outer surface, of the body ID are coated with asubstance which will prevent penetrationof the liquid contents of thecontainer, after it is charged, into the fibrous walls of the container.The container is charged after assembly of the bottom closure but priorto closure of the small end, in which event the top closure 'willcomprise a disc l3, having a peripheral frusto-conical flange l3 whichengages the outer surface of the body III at its upper end. In the eventthat the container is charged'through its bottom or larger end, theclosuremeans for the small end may comprise, in addition to the flangeddisc l3, an inner flanged disc II, the

peripheral frusto-conical flange H of which closely engages the conicalinner surface of the body Ill at its upper end. Suitable adhesivesubstances are employed to secure the closure discs l3 and I4 in thepositions in which they are shown.

A container formed as just described is sufliciently durable towithstand all shocks and blows due to ordinary handling andtransportation. Where the container is to be transported long distances,however, or it is expected that, due to any one of various reasons, itwill or may be subjected to rougher handling, a frusto-conicalreinforcing envelope may be placed over it. Such an envelope isillustrated in Figure 2 and will be seen to comprise a conical memberl5, open at top and bottom. It is also formed by winding an adhesivecoated paper sheet upon a conical mandrel and thereafter accuratelytrimming the ends of the resulting article. Prior to assembly with thecontainer proper its exterior surface may be ,appropriately decoratedand its inner surface coated wholly or partially with an adhesive. Whenassembled the inside surfaces thereof adjacent its upper and lower endswill bear against and closely engage the exterior surfaces of theflanges l2 and I3 of the outer, lower and upper closure discs I2 and i3.After the adhesive has dried the envelope ISis firmly secured inposition and not only serves as a protector for the conical wall of thecontainer proper but likewise as an auxiliary means for securing theclosure discs l2 and IS in position. .Hence not only is theside wall ofthe container strengthened but likewise its top and bottom seals. As

has previously been pointed out, the envelope I5 is made use of onlywhen necessary and hence a very substantial saving is realized in theproduction and wide distribution of a large volume of a liquid commoditysuch as'oil, -the wall of the container proper l0 being made only justsufliciently thick and durable to withstand minor shocks incident tolocal transportation and handling.

The protective envelope may be permanently attached to the containerproper, if desired, by inturning its edges so as to engage the top andbottom seals of the container. Such a construction is shown in Figure 4,where the envelope 20 has its inturned edges 20 and 20 in engagementwith the top and bottom sealing caps 2| and 22 respectively. It will beobserved that, in this form of container, both of the sealing caps 2|and 24 may be applied from the outside, so that the container may becharged with liquid introduced through its small end or top opening. Itwill be perceived thatthe outer sealing cap 2| has a frusto-conicalflange which flts against the outer surface of the container body 23-whereas the cup-shaped inner sealing cap 24 has a peripheral flange 24which is adapted to rest upon the upper edge of the container body 23.

Both caps are retained in position by an adhesive coating substance andby the inturned edge of the outer envelope. It will be observed that theliquid contents of the container cannot come into contact with theedge,of either of the caps 2|, 24 or with the edges of either of bottom.

ing composition and the top and bottom closure 1 discs are preferablycoated on all surfaces by dipping, prior to assembly.

In the form of container shown in Figure 6 the top is closed by a singlecap 30 and the bottom by a single flanged disc 3|. The flange 3| of disc3| is cylindrical when the disc is applied to the container body 32, asindicated in dotted lines, but is inwardly deflected by a rolling oper-'ation to its full line or container wall enga g position. A Having thusdescribed the invention, what is claimed as new and desired to besecured by Letters Patent isz' 1. A self-supporting conical papercontainer comprising a hollow frusto-conical body portion and closuresfor the ends thereof, each such closure comprising a dischaving aperipheral frusto-conical flange, the inner surfaceof each flangeclosely engaging the outer surface of said body portion, and aseparately formed relatively stifl' frusto-conical paper envelopeenveloping the said body portion and closely engaging and securing saidflanges.

2. A self-supporting conical paper container at the larger end thereofclosely engaging andsecuring the peripheral flange of said closure theflange of one disc closely engaging the inner disc. surface of the bodyand the flange oi the second 3. A self-supporting conical papercontainer disc closely engaging the outer surface of the comprising ahollow frusto-conical body portion body, and a relatively stiff,frusto-conical enand closures "ior the ends thereof, each end velopeencircling said body and closely engaging 5 closure including twoclosure discs disposed the flange of said second disc. transversely ofthe body, both discs at each end having integral peripheralirusto-conical flanges, CHARLES K. DUNLAP.

